Then apply whatever layout suitable to communicate what is an action (button styles, with or without icon), what is going on (spinner, dot dot dot), so it conforms to the rest of the colors and symbolics of your webpage.

They say 90% of user actions are based on her current experience. Based on that, I believe current user experience is that controls should express current state of the system. In addition button is supposed to be clickable.

So, it looks like you should have button text related to current state and the button itself will suggest the state is changeable.